<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片试图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps
        :space="200"
        :active="activeIndex-0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane
            label="基本信息"
            name="0"
          >
            <el-form-item
              label="商品名称"
              prop="goods_name"
            >
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item
              label="商品价格"
              prop="goods_price"
            >
              <el-input
                v-model="addForm.goods_price"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item
              label="商品重量"
              prop="goods_weight"
            >
              <el-input
                v-model="addForm.goods_weight"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item
              label="商品数量"
              prop="goods_number"
            >
              <el-input
                v-model="addForm.goods_number"
                type="number"
              ></el-input>
            </el-form-item>
            <el-form-item
              label="商品分类"
              prop="goods_cat"
            >
              <el-cascader
                expandTrigger='hover'
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品参数"
            name="1"
          >
            <!-- 渲染表单的item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb,i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品属性"
            name="2"
          >
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane
            label="商品图片"
            name="3"
          >
            <!-- action:图片上传的后台API地址 -->
            <!-- on-preview:预览图片 -->
            <!-- on-remove：单击 x 号的时候触发 -->
            <!-- list-type：图片的预览方式 -->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button
                size="small"
                type="primary"
              >点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane
            label="商品内容"
            name="4"
          >
            <!-- 副文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 按钮 -->
            <el-button
              type="primary"
              class="btnAdd"
              @click="add"
            >添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%"
    >
      <img
        :src="previewPath"
        alt=""
        class="previewImg"
      >
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      //切换步骤条
      activeIndex: '0',
      //添加商品的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        //商品所属的分类数组
        goods_cat: [],
        //图片数组
        pics: [],
        //商品的详情描述
        goods_introduce: '',
        attrs: [],
      },
      //添加商品的数据对象的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择三级商品种类', trigger: 'blur' }
        ]
      },
      //商品分类列表
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      //动态参数列表
      manyTableData: [],
      //静态属性列表数据
      onlyTableData: [],
      //上传图片的网址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      //控制图片预览的对话框
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败');
      //把数据了列表赋值给cateList
      this.cateList = res.data
      console.log(this.cateList);
    },
    //级联选择器选择项变化，会触发
    handleChange() {
      console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    //阻止标签页的切换
    beforeTabLeave(activeName, oldActiveName) {
      //activeName：即将进入标签页名字
      //oldActiveName：即将离开的标签页名字
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类！')
        return false
      }
    },
    //切换标签会触发
    async tabClicked() {
      //证明访问的是商品参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }
        console.log(res.data);
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败！')
        }
        console.log(res.data);
        this.onlyTableData = res.data
      }
    },
    //处理图片预览效果
    handlePreview(file) {
      console.log(file);
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    //处理移除图片的操作
    handleRemove(file) {
      console.log(file);
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从 pic 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => {
        x.path === filePath
      })
      // 3.调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm);
    },
    //监听图片上传成功的事件
    handleSuccess(response) {
      console.log(response);
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片信息对象，push 到 pics 数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm);
    },
    //添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        const form = _.cloneDeep(this.addForm)
        //执行添加的业务逻辑
        form.goods_cat = form.goods_cat.join(',')
        //处理动态参数s
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form);

        //发起请求添加商品
        //商品的名称是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return null
      }
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>